Where two or more people agree to commit a crime or actively associate in a joint unlawful enterprise, each will be responsible for specific criminal conduct committed by one of their number which falls within their common design. An accomplice who knows or realizes there is a real risk that an actual perpetrator intends to commit a crime, and renders any form of assistance (including material support, encouragement, or moral support) that enables, assists or encourages the perpetrator to commit the crime, is criminally liable for that crime. Continued association with a criminal gang after witnessing a murder, particularly when hunting for additional victims, constitutes sufficient participation to establish accomplice liability for murder with actual intent. The crime committed by the actual perpetrator must fall within the parameters of the group's common objective for accomplice liability to attach.